Manufacturing And Production Technology
A jig is defined as a device which

Holds and locates a workpiece during an inspection or for a manufacturing operation
Holds and locates a workpiece and guides and controls one or more cutting tools
Is used to check the accuracy of workpiece
All of these

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Manufacturing And Production Technology
Threading is an operation of

Sizing and finishing a small diameter hole
Smoothing and squaring the surface around a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Cutting helical grooves on the external cylindrical surface

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